body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #f0f4f8;
}

.container {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
}

header {
  background: #2c3e50;
  color: white;
  padding: 20px;
  text-align: center;
  font-size: 24px;
}

aside {
  background: #34495e;
  width: 200px;
  min-height: 100vh;
  position: fixed;
  top: 80px;
  left: 0;
  padding-top: 20px;
}

aside ul {
  list-style: none;
  padding: 0;
}

aside li {
  margin: 10px 0;
}

aside a {
  color: #ecf0f1;
  text-decoration: none;
  display: block;
  padding: 10px 20px;
}

aside a:hover {
  background: #3b5998;
}

main {
  margin-left: 200px;
  padding: 20px;
  flex: 1;
}

.card {
  background: white;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.btn {
  display: inline-block;
  margin: 5px 5px 10px 0;
  padding: 8px 16px;
  background: #3498db;
  color: white;
  border: none;
  border-radius: 4px;
  text-decoration: none;
  font-size: 14px;
  cursor: pointer;
}

.btn:hover {
  background: #2980b9;
}

.table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}

.table th, .table td {
  border: 1px solid #ddd;
  padding: 10px;
  text-align: center;
}

.table th {
  background: #f7f9fb;
}

.form-group {
  margin-bottom: 15px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: bold;
}

.form-group input {
  width: 100%;
  padding: 8px;
  border: 1px solid #ccc;
  border-radius: 4px;
}
